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Discontinuity-induced bifurcations in systems with impacts and friction: Discontinuities in the impact law
KTH, School of Engineering Sciences (SCI), Mechanics, Biomechanics.
2009 (English)In: International Journal of Non-Linear Mechanics, ISSN 0020-7462, E-ISSN 1878-5638, Vol. 44, no 10, 1011-1023 p.Article in journal (Refereed) Published
Abstract [en]

This paper concerns the non-smooth dynamics of planar mechanical systems with isolated contact in the presence of Coulomb friction. Following Stronge [impact Mechanics, Cambridge University Press, Cambridge, 2000], a set of closed-form analytic formulae is derived for a rigid-body impact law based on an energetic coefficient of restitution and a resolution of the impact phase into distinct segments of relative slip and stick. Thus, the impact behavior is consistent both with the assumption of Coulomb friction and with the dissipative nature of impacts. The analysis highlights the presence of boundaries between open regions of initial conditions and parameter values corresponding to distinct forms of the impact law and investigates the smoothness properties of the impact law across these boundaries. It is shown how discontinuities in the impact law are associated with discontinuity-induced bifurcations of periodic trajectories, including non-smooth folds and persistence scenarios. Numerical analysis of an example mechanical model is used to illustrate and validate the conclusions.

Place, publisher, year, edition, pages
2009. Vol. 44, no 10, 1011-1023 p.
Keyword [en]
Rigid body mechanics, Coulomb friction, Impact, Non-smooth, Bifurcation, Discontinuities, smooth dynamical-systems, grazing bifurcations, multibody systems, local analysis, collisions, oscillators, motion
URN: urn:nbn:se:kth:diva-18957DOI: 10.1016/j.ijnonlinmec.2009.05.009ISI: 000271711800001ScopusID: 2-s2.0-70349807872OAI: diva2:337004
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2011-01-13Bibliographically approved

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